1, solid particles: such as construction waste, domestic waste, industrial waste residue, etc.

2. Garbage: including domestic garbage, industrial garbage, construction garbage and hazardous waste;

3. Slag: such as blast furnace slag and slag;

4. Sludge: including sludge from domestic sewage treatment plants and industrial sludge;

5. Wastes, damaged utensils and defective products: such as scrap metal, discarded electrical and electronic equipment, etc.

Solid waste, referred to as solid waste for short, refers to solid and semi-solid waste produced in production and daily life. They may come from industrial production, urban construction, agricultural activities, daily life and other aspects. With the rapid development of social economy, the output of solid waste in China has increased year by year, which has brought great pressure to the environment. Therefore, how to effectively treat and utilize solid waste has become an urgent problem.

Industrial solid waste refers to the waste produced in the process of industrial production, such as smelting waste residue, chemical waste residue, tailings and so on. With the acceleration of industrialization in China, the output of industrial solid waste has increased year by year. Some of these solid wastes contain toxic substances harmful to orange limbs, which pose a serious threat to the environment and human health; Others contain recyclable resources and have high economic value. Therefore, the treatment and utilization of industrial solid waste should not only pay attention to environmental protection, but also give full consideration to resource recovery.

Domestic garbage refers to the wastes produced by people in their daily lives, such as kitchen waste, recyclable materials and hazardous wastes. With the acceleration of urbanization, the amount of domestic garbage is increasing. Classifying these wastes is conducive to improving resource utilization and reducing environmental pollution. Agricultural waste refers to the waste produced in the process of agricultural production, such as straw, manure, agricultural film and so on.

If these wastes are not treated, they will pollute the environment such as soil and water. Therefore, the treatment and utilization of agricultural waste is an important link to ensure the sustainable development of agriculture. Construction waste refers to the waste materials produced in the process of urban construction, such as bricks, concrete, wood, etc. With the acceleration of urbanization, the output of these wastes has increased year by year. Resource utilization of construction waste can reduce resource consumption and environmental pressure.